Also found in: Thesaurus.
1. Contrary to truth; not true.
2. Given to falsehood; mendacious. See Synonyms at dishonest.
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|Adv.||1.||untruthfully - in a mendacious and untruthful manner; "I told him, quite untruthfully, that I had just returned from leave"|
truthfully - with truth; "I told him truthfully that I had just returned from my vacation"; "he answered the question as truthfully as he could"